Hydrothermal co-carbonization of sewage sludge and fuel additives: Combustion performance of hydrochar

Wilk, Małgorzata; Śliz, Maciej; Lubieniecki, Boguslaw

doi:10.1016/j.renene.2021.06.101

Cited by 66 publications

(21 citation statements)

References 59 publications

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“…However, some other previous works argued that the change trend of ash content of low-ash straw biomass after hydrothermal carbonization was different [9][10][11]. An increase of ash in the hydrochar is observed, due to excessive loss of volatile matter, retention of minerals and degradation of organic substances [27]. A similar trend was found in the HTC of eucalyptus bark waste, rice husk and grape residue [28].…”

Section: Ultimate and Proximate Analysismentioning

confidence: 71%

Effect of hydrothermal carbonization temperature on fuel properties and combustion behavior of high-ash corn and rice straw hydrochar

Sui

Wang

et al. 2023

Therm sci

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Hydrothermal carbonization (HTC) has been proven to improve the fuel properties of low-ash straw biomass. To explore the effect of HTC on high-ash straw biomass, the fuel properties and combustion behavior of hydrochar prepared by high-ash rice straw and corn straw at different temperature were studied. The results showed that increased reaction temperature could improve the C content, fixed carbon, heating value and fuel ratios (FC/VM) in high-ash straw hydrochars, which is similar to the change trend of low-ash biomass. The hydrochar prepared at 260?C has similar H/C and O/C atomic ratios and FC/VM to lignite. In addition, the highest energetic recovery efficiency is obtained at 200?C. While at 180?C, the comprehensive combustion characteristic index of the hydrochar is the best, which is 5.04?10-11 (min-2?K-3) and 6.42?10-11 (min-2?K-3). In addition, the C content in the hydrochars at 180?C was lower than the raw material, and the ash content increases with the reaction temperature, which is quite different from the low-ash biomass. In conclusion, the HTC could improve the fuel quality of high-ash straw, while its ash content remains at a high level.

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Section: Ultimate and Proximate Analysismentioning

confidence: 71%

Effect of hydrothermal carbonization temperature on fuel properties and combustion behavior of high-ash corn and rice straw hydrochar

Sui

Wang

et al. 2023

Therm sci

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“…The two components in sludge that are technically and economically possible for recycling are nutrients (mainly nitrogen and phosphorus) and energy (carbon). However, because sewage sludge consists of approximately 98% water, in this research, sawdust (SD) and corn stalk waste (CS) are used as lignocellulosic biomass that have a high percentage of cellulose and lignin as feed together with sewage sludge, in order to achieve high-quality hydrochar [ 9 ]. Some of the existing or emerging energy recovery methods from SS are anaerobic digestion, incineration, and co-incineration of sludge in coal-fired power plants, conversion to gas, pyrolysis, and wet air oxidation, supercritical oxidation, and hydrothermal reaction, which is called hydrothermal carbonization (HTC) in the present study [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Carbonization of Sewage Sludge with Sawdust and Corn Stalk: Optimization of Process Parameters and Characterization of Hydrochar

et al. 2023

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Disposal of sewage sludge (SS) is one of the problems in treatment plants; however, SS has a high-water volume and lacks some compounds and can be mixed with other biomass. The present study analyzed co-hydrothermal carbonization of sewage sludge with sawdust and corn stalk. This research aimed to optimize the process parameters, the temperature in the range of 180–300 °C, the reaction time in the range of 30–60 min, and pH in the range of 5–9 on the mass yield, energy yield, and high heat value (HHV) to increase the quality of hydrochar, and to analyze the effect of hydrothermal carbonization (HTC) on the characteristics of raw materials and hydrochar. The response surface method and Benken’s box model were conducted using Design Expert 10 software. The optimal conditions for HHV, mass yield, and energy yield were 15.802 MJ/kg, 63.754%, and 67.415% respectively which occurred in the 205.358 °C, 30 min reaction time, and pH of 5. The temperature was the most influential parameter. The morphological, physicochemical, thermal, and crystalline properties of the hydrochar with the maximum HHV, mass yield and energy yield were evaluated as well. These results demonstrate that HTC is a suitable process to produce hydrochar, which can be used as a direct solid fuel. Highlights • Hydrothermal carbonization of sewage sludge with sawdust and cornstalk was investigated. • Response surface optimization hydrothermal carbonization process was studied. • The morphological, physicochemical, thermal, and crystalline properties of the hydrochar are reported. • The optimal HHV was 15.802 MJ/kg. • The process can produce hydrochar which can be used for direct combustion or activated carbon. Graphical abstract

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“…Within short retention time (1-12 h), the biomass in converted in three fractions: a solid-coal matrix (hydrochar, HC), a liquid fraction (process water, PW) and a small amount of gas (mainly composed by CO 2 ) [4]. HC is a densified solid product able to retain carbon (C) into its structure, improving its fuel properties [5,6]. It is also characterized by a high porosity, which suggest its suitability as activated carbon or as soil conditioner [7].…”

Section: Introductionmentioning

confidence: 99%

Environmental Life Cycle Assessment of Hydrothermal Carbonization of Sewage Sludge and Its Products Valorization Pathways

Mannarino

Caffaz²,

Gori

et al. 2022

Waste Biomass Valor

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This study is aimed at evaluating through Life Cycle Assessment (LCA) the environmental performances of an integrated system of an existing Water Resources Recovery Facility (WRRF) and a hypothetical hydrothermal carbonization (HTC) plant applied to the generated sewage sludge (SS). Beside the valorisation of the solid product (hydrochar, HC) as a fuel substituting lignite, the possibility to valorize also the liquid fraction (process water, PW) derived by the HTC, by anaerobic digestion to produce biogas, is here proposed and analysed. Additionally, phosphorus recovery from HC, prior its use, by acid leaching with nitric acid is also suggested and evaluated. Thus, four integrated scenarios, based on SS carbonization, are proposed and compared with the current SS treatment, based on composting outside of the WRRF (Benchmark scenario). The proposed scenarios, based on HTC, show improved performances with respect to the benchmark one, for thirteen of sixteen considered impact indicators. For the Climate Change (CC) indicator, the two HTC scenarios are able to reduce the impacts up to -98%, with respect to the Benchmark. Further, the introduction of anaerobic digestion of PW proves to reduce impacts more than other configurations in eleven on sixteen impact categories. On the contrary, the introduction of phosphorus recovery process negatively affects the values for most of indicators. Thus, possible solutions to improve the integration of this process are outlined (e.g., the use of sulfuric acid instead of nitric one, or the application of a different ratio between solid and acidified solution during acid leaching of HC to recover phosphorus).

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Hydrothermal co-carbonization of sewage sludge and fuel additives: Combustion performance of hydrochar

Cited by 66 publications

References 59 publications

Effect of hydrothermal carbonization temperature on fuel properties and combustion behavior of high-ash corn and rice straw hydrochar

Effect of hydrothermal carbonization temperature on fuel properties and combustion behavior of high-ash corn and rice straw hydrochar

Hydrothermal Carbonization of Sewage Sludge with Sawdust and Corn Stalk: Optimization of Process Parameters and Characterization of Hydrochar

Environmental Life Cycle Assessment of Hydrothermal Carbonization of Sewage Sludge and Its Products Valorization Pathways

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